Richard CanonNews / Thursday, January 17, 2019 / Categories: Canon Patents This post may contain affiliate links(s). An affiliate link means I may earn advertising/referral fees if you make a purchase through my link, without any additional cost to you. It helps to keep this site afloat. Thank you in advance for your support. If you like what we do here, maybe buy me a coffee. Canon Patent Application: Diffractive Optics 500 and 600mm Super Telephotos Canon continues to pour money and resources into the development of diffractive optics super telephotos. We have seen a prototype of a 600mm for over a year now, and here's another patent application that describes 500mm and 600mm diffractive optics super telephotos. From my understanding, this patent deals with instead of making the gains by using a diffractive element size of the lens, in this case, they want to use a diffractive optical element to reduce the weight. Focal distance 584.99 F number 4.12 a half field angle (degree) -- 2.12 Image height 21.64 Whole length of the lens 474.74 BF 109.42 Focal distance 487.49 F number 4.12 a half field angle (degree) -- 2.54 Image height 21.64 Whole length of the lens 409.74 BF 98.42 Japan Patent Application 2019-008047 Richard CanonNewsRichard CanonNews Richard has been using Canon cameras since the 1990s, with his first being the now legendary EOS-3. Since then, Richard has continued to use Canon cameras and now focuses mostly on infrared photography. Richard is the founder and editor of CanonNews since 2017, and has worked as a writer on CanonRumors and other websites in the past. Other posts by Richard CanonNews Contact author Facebook page Previous Article Canon Patent Application: Canon RF 24-70 2.8 Next Article Canon Patent Application: Cini Zoom lens Print Tags: Canon Patent ApplicationDIffractive Optics Please login or register to post comments.